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A tunable frequency-doubled optoelectronic oscillator (FD-OEO) scheme based on a phase modulator (PM) located in a Sagnac loop is proposed and experimentally demonstrated. A light wave is halved and sent to the Sagnac loop along the clockwise (CK) and counter-clockwise (CCK) directions. The light wave along the CK direction is effectively modulated in the PM, while the one along the CCK direction...
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